HP 3457A Service Manual page 137

c, Remove the Wiring Block from the Strain Relief Housing (Figure 5-3, Step 3).
d. Install a copper shorting wire between the H and L inputs of channel 0. Tighten the two retaining
screws. (Refer to Figure 5-5 for wire connection).
e. Connect the prepared Wiring Block Assembly to the HP 44492A 10 Channel Multiplexer Assembly.
5-65. DC Volts Offset Calibration - HP 44492A
a. Select the DC Voltage function. (Press the DCV function key ).
b. Select the Scanner Input. (Press the TERM configuration key, enter the number 2 and press the ENT key ),
d, Use the following procedure to calibrate the DC offset on the 300 V, 30 V, 3 V, 300 mV and
30 mV ranges beginning with the 300 V range.
2. Access the Calibration Command. (Press the Blue SHIFT key, then the OFFSET COMP / C configura-
tion key). The display will show CAL.
3, Enter the value of the input - in this case 0, (NOTE: If the security feature has not been disabled (set to
0), it will be necessary to enter the input value, the delimiter (,) and the security code).
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
" running.
e. Repeat steps "dl" through " d4" for each of the remaining ranges.
5-64. Two-Wire Ohms Offset Calibration - HP 44492A
a, Select the 2-Wire Ohms function, (Press the OHM function key ).
c. Use the following procedure to calibrate the 2-wire ohm offset on the 30 Mohm, 3 Mohm,
300 Kohm, 30 Kohm, 3 Kohm and 300 Ohm ranges beginning with the 30 Mohm range.
4, Press the ENT key. The display will show CALIBRATING while the calibration routine is
running.
5-19